Plastic scoop with cast nubbin insert



Sept. 1, 1959 L. H. MORIN PLASTIC scooP WITH CAST NUBBIN INSERT Filed Sept. 16, 1952 INVENTOR ATTOR EY llouisflMorein United States Patent PLASTIC SCOOP WITH CAST NUBBIN INSERT Louis'H. Morin, Bronx, N.Y. Applicationseptember 16, 1952, Serial No. 309,811 Claims. (Cl. 24-205.13)

This invention relates toseparable fastener stringers employing scoops arranged longitudinally of one edge portion of a stringer tape. More particularly, the invention deals with a structure of this type and kind, wherein cast nubbins are formed at predetermined spaced intervals along a tape edge, after which nylon or other plastic scoop bodies are formed around the nubbins in producing the resulting fastener stringer. Still more particularly, the invention deals with a structure of the character de scribed, wherein the nubbins include extended lug portions exposed through surfaces of the resulting scoops, the lugs being utilized to locate the nubbins in the mould cavities, preparatory to forming the plastic scoops thereon.

The novel features of the invention will be best understood from the following description, when taken together with the accompanying drawing, in which certain embodiments of the invention are disclosed and, in which, the separate 'parts are designated by suitable reference characters in each of the views and, in which:

Fig. 1 is a perspective view diagrammatically illustrating the formation of nubbins on a tape edge and the formation of scoops on the nubbins, part of the construction being broken awayan'd in section.

Fig. 2 is a partial section on the line 2-2 of Fig. 1 showing the tape edge and part of the nubbin in elevation; and

Fig. 3 is a partial section on the line 3-3 of Fig. 1, line 3-3 cutting the right half of the scoop.

In Fig. 1 of the drawing, I have diagrammatically illustrated at part of a stringer tape, on the beaded edge 11 of which is arranged a series of longitudinally spaced nubbins 12. The nubbins 12 are formed as metallic die castings and comprise a body portion 13, which envelopes the tape edge 11 and extends onto the tape 10 adjacent the bead 11 to a slight extent, as seen at 14.

The forward end of the body 13, beyond the bead 11, has upwardly and downwardly contracted walls 15 and 16, respectively, which walls also flare in the direction of the tape to a slight extent from the central portion 17, as will clearly appear from a consideration of Fig. 1 of the drawing. The body 13 has laterally extending lugs 18 which are preferably made slightly conical in form and these lugs form centering members for positioning the nubbin 12 centrally between opopsed side walls of a die cavity, in which the resulting scoop is to be formed. The body 13 also has, at each side of the beaded edge 11, upwardly and downwardly extending and slightly tapered lugs 19 and these lugs extend to upper and lower walls of a cavity to center the nubbin between such walls in the operation of forming the moulded scoop 20, which is preferably formed of nylon or other plastic material.

In Fig. 1 of the drawing, two of the scoops 20 are shown attached to nubbins 12, the scoops 20 comprising mounting end portions 21 which completely envelope the body portion 13 of the nubbin and all of the lugs 18 and 19, except the outer ends thereof, which ends are clearly indicated at 18' and 19' on the lower scoop of Fig. 1. The exposure of these surfaces is also clearly illustrated in Figs. 2 and 3.

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At 22 in Fig. 1 I have indicated the coupling end portions of the scoops 20 and, while my present invention is not concerned specifically with the particular coupling end portion employed, the scoops shown are of the type and kind disclosed in my prior application Ser. No.

' 307,279, filed August 30, 1952, now Patent No. 2,798,274.

For purposes of general identification, the coupling end portion comprises a male coupling head 23 having a recessed side, as at 24, and a female coupling neck 25 defined by substantially V-shaped upper and lower recesses disposed inwardly of the head 23. The female coupling portion has, on the recessed side 24, projections 26 which are adapted to enter the recesses 24 of scoops of an opposed stringer, not shown, in coupling a pair of stringers together, as clearly illustrated in the application, above identified. As shown in Fig. 3, the bevelled walls 15 and 16 on the nubbin help to provide a uniform thick-, ness for the plastic portion of the scoop adjacent the reduced neck or recess 25.

It will also be understood that the male coupling heads 23 at the other side of the scoop engage the recesses of I the female coupling necks or portions 25 of scoops of an opposed stringer. The heads 23 and projections 26 terminate at the longitudinal center of the scoop and it will appear that, when scoops of stringers are coupled to-" gether, the projections 26 operate to retain the coupled scoops against transverse separation.

It will be understood that, in forming separable fas-' teners of the kind under consideration, the nubbins will be die cast directly upon the tape edge 11 at predeter-" mined spaced intervals to provide the proper spacing between the resulting scoops to be attached thereto and these nubbins will be firmly anchored on the tape edge by virtue of the extension of the molten metal into the interstices of the bead of the tape, thus securely fixing the'nubbins' on the tape against movement or displace ment. As will be understood, the tapering of lugs 18 and 19 facilitates the opening and closing of the dies in which the nubbins are formed. The tape with the nubbins thereon is then automatically fed into and through an injection moulding machine to position the nubbins centrally with respect to predetermined walls of the cavity, thus facilitating complete envelopment of the nubbins, except for the centering lugs or elements, outer surfaces of which will be exposed on the resulting scoops as has been clearly set forth. In this connection, lugs 19, which engage the beaded edge 11, not only act to help center the nubbin in the die cavity in which scoop 20 is formed but also help to more firmly anchor the nubbin to the beaded edge.

By constructing fasteners in the manner described, plastic scoops will have a reinforced mounting on the tape edge and will be positively retained against displacement or movement relatively to the tape. The nubbins will take up the stresses or strains to which the mounting end portion of the scoops is subjected in the operation of the fastener.

The present scoops are particularly suitable for fasteners for military use wherein extreme climatic conditions are likely to be encountered. In hot climates, they will not be uncomfortable to touch, as metal fasteners are with their high heat retentive properties; and in cold climates, they will not cause frost burns and will not be apt to become iced and inoperative, as with metal devices. Furthermore, they are lighter in weight, and they are not subject to corrosion like metal fasteners.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A separable fastener stringer, comprising an elongated beaded tape, die cast metallic nubbins spaced longitudinally of one edge of the tape, the nubbins at opposed sides of the tape having upwardly and downwardly and outwardly extending lugs, said upwardly and down- Wardly extending lugs engaging the beaded tape to more I firmly anchor the nubbins thereto, a plastic scoop body enveloping the major portion of each of said nubbins to form a scoop, outer ends of said lugs being exposed at upper, lower and side surfaces of said scoops, end surfaces of said lugs being flat and in alinement with outer surfaces of said scoops.

2. A reinforced plastic scoop structure for separable fasteners of the character described, said scoop structure comprising a metallic nubbin secured to and projecting beyond a tape edge and a plastic shell enveloping said nubbin, said shell having a coupling end portion protruding beyond the tape edge, said nubbin having projecting members arranged on both sides of the tape and engaging said tape edge, said'projecting members having outwardly tapered walls, outer ends of said members having flat surfaces, and said flat surfaces terminating in alinement with outer surfaces of the plastic shell.

3. A separable fastener stringer comprising a tape having scoops spaced longitudinally about the beaded edge of said tape, each scoop having a mounting end portion attached to the tape and a coupling end portion protruding beyond one edge thereof, each scoop comprising a metallic die cast nubbin attached to the tape and a plastic shell portion enclosing said nubbin, said nubbin comprising a body portion attached to the beaded edge of the tape and a wall portion protruding beyond the tape edge, said wall portion being tapered towards the forward end thereof to form a transversely extending free edge, said free edge diverging from the center thereof to the sides of the nubbin, lugs projecting from top and bottom surfaces of the body portion of the nubbin and on opposite sides of the tape head, said lugs engaging said head, a lug extending outwardly from each side of the nubbin and in alinement with the tape bead, each lug being tapered towards the free outer end thereof, the nubbin having top, bottom, and side surfaces thereof spaced from the corresponding outer surfaces of the plastic portion of the scoop by the length of said respective lugs, the outer end surfaces of the lugs being flat and being exposed through,

and flush with, the corresponding surfaces of said plastic shell portion, the coupling end portion of each scoop being entirely covered by nylon so that no part of the metal of said nubbin is exposed, substantially all of said coupling end portion being of plastic, and said plasticenclosed nubbin scoop have a more secure anchor to the tape than a scoop composed entirely of nylon.

4. A separable fastener stringer comprising a tape having scoops spaced longitudinally of the beaded edge thereof, each scoop having a mounting end portion and a coupling end portion, each scoop comprising a metallic die cast insert attached to the tape and a plastic shell portion enclosing said insert, projections extending from top and bottom surfaces of the insert and engaging the tape bead, a projection extending outwardly from each side of the insert and in alinement with the tape bead, each projection being tapered towards the free outer end thereof, the insert having top, bottom, and side surfaces thereof spaced from the corresponding outer surfaces of the plas- References Cited in the file of this patent UNITED STATES PATENTS 1,218,596 Conklin Mar. 6, 1917 1,977,876 Groff Oct. 23, 1934 2,064,435 Loeffier Dec. 15, 1936 2,203,694 Morin June 11, 1940 2,305,623 Kuna Dec. 22, 1942 2,526,600 Bolten Oct. 17, 1950 2,563,767 Winterhalter Aug. 7, 1951 2,684,503 Silver July 27, 1954 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No, 2,901,802 September 1, 1959 Louis Morin It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 1, line 58, for "opops'ed read opposed ====3 column 4, line for "nylon" read plastic line 6, for "have" em having line '7, for "nylon" read plastic Signed and sealed this 23rd day of February 1960.,

ttest: 1 KARL H..AXLINE ROBERT C. WATSON Commissioner of Patents Attesting Oflicer 

